Load transient frequency modulation in fixed frequency PWM regulator

Abstract

A regulator circuit to regulate a voltage for a load includes a sensing circuit to sense a change in voltage for the load, a variable frequency circuit to output a signal having a frequency component; and a control circuit responsive to the sensing circuit to control the variable frequency circuit by changing the frequency component and the voltage.

1 . A regulator circuit to regulate a voltage for a load, comprising: 
 a sensing circuit to sense a change in voltage for said load,    a variable frequency circuit to output a signal having a frequency component; and    a control circuit responsive to said sensing circuit to control said variable frequency circuit by changing said frequency component and the voltage.    
   
   
       2 . A regulator circuit to regulate the voltage for the load as in  claim 1 , wherein said variable frequency circuit includes a PWM circuit.  
   
   
       3 . A regulator circuit to regulate the voltage for the load as in  claim 1 , wherein said control circuit includes a current mirror.  
   
   
       4 . A regulator circuit to regulate the voltage for the load as in  claim 1 , wherein said control circuit is controlled by a current.  
   
   
       5 . A regulator circuit to regulate the voltage for the load as in  claim 1 , wherein said variable frequency circuit includes a variable frequency oscillator circuit.  
   
   
       6 . A regulator circuit to regulate the voltage for the load as in  claim 1 , wherein said variable frequency circuit includes a modulator circuit.  
   
   
       7 . A method to regulate a voltage for a load, comprising the steps of: 
 sensing a change in said voltage for the load;    outputting a voltage having a frequency component; and    controlling the voltage by changing the frequency component.    
   
   
       8 . A regulator circuit to regulate the voltage for the load as in  claim 7 , wherein said step of controlling the voltage including the step of using a PWM circuit.  
   
   
       9 . A regulator circuit to regulate the voltage for the load as in  claim 7 , wherein said step of controlling including the step of using a circuit mirror.  
   
   
       10 . A regulator circuit to regulate the voltage for the load as in  claim 7 , wherein said step of controlling including the step of controlling a current.  
   
   
       11 . A regulator circuit to regulate the voltage for the load as in  claim 7 , wherein said step of controlling the voltage including the step of using a modulator circuit.